Typewriting machine



Feb. 23 ,1926. 1,574,298

J..,LINDBURG TYPEWRITING MACHINE Filed Feb. 25; 1924 IIIII /m/e/r for patented Feb. 23, 192, i

JOSEPH LINDBRG, Or BAY. RIDGE, BROOKLYN, NNW Yorin, AssreNon 'ro UNDER- WOOD myrnwnrrnn comrANY, or New YORK, N. Y., a CORPORATION or DELA'- AApplication. filed February To all whom t may concern.'

Beit kno'wnthat I, JOSEPH -LINDBUNG, a ycitizen of the United States, residing-in Bay Ridge, Brooklyn, inthe county of Kings,

city and State of NewYork, have invented' certain newv and useful Improvements in ypewritingMachines, of which the follow- Lin is a specification. i his invention relates to 4card-guiding 1Q and card-gaging means for the revoluble platens of front-strike typewriting machines, and embodies improvements over the structure shown in the patent to Helmond, No. 1,302,161, in which the wing-scale .and card-guiderare shiftableup and down with the platen, being for' that purpose 'mounted upon arms which are connected to ther platen-shift-rail, and which are alsoconflned -by spring-lingers secured ',upon the fixed type-bar segment and, having rolls to run.

' upon the-wing-scale. y

.It is an object of the present invention to enable the machine to control'sti` cards.'`

vrThese cards have to'bend in passing around the platen' which places them under stress,

.causingthem to tend to straightenr out .and

to bulge forward at .the middle, away from.

the platen.v This'bulging Occurs in the very portin v of a card where the types must 4 d@ strike, and where therefore the card needs to'be supported or Vbacked in order to re` ceive the impression,

'This troublefisgovercome byv locating the scale-pressing rolls in direct engagement 3.5 Withthe scale relatively close `to-the printingfpoint,-where they ress the thin metal scalezgjand guide towar the laten without riff-.and thus overcome t e tendency of the A'middle kfe' rolls bear upon the 'wing-scale at Oiints close t upvvardly-eXtending-guiding orns, which are made in the formiof projections rising from the upper edge of the 415 wing-scale, one at each side of the printing4 point. The horns are each or' ta ering trm with ed esv-aring-away from t e `platen so as to stiffen the horn and also reduce the extentot rubbingfcontact with the stid card which is bent around theplaten.

'lhe `Wing-scale is sugported at its lower edge to,\the.front' of t e platen and is inclined. to the rear in lsuch a Way that the o rtion of the card-'to' bulgelll awa 1i-rom t e platen.

rvrnwnrrme madame.

23,1924. "serial No. 694,548,

`upper graduated edge lies closely adjacent the platen, while the body of the wing-scale clears the platen-so as to avoid vcontact with the worl. Since the wing-scale rises ver- 'tically with the case-shift frame of the 'machine, it is important that the springpressed rolls, which ,bear against the wingvscale, engage verticalsurfaces, for otherwise the pressure ofthe rolls against the VNwingscale and of the Wing-scale against the platen would be varied by the case-shifting movement of the scale.` Such case-shifting movement, moreover, Would'b op osed in one direction by the pressure oft e rolls. Tapering bossesl are accordingly pressed forward from theV body of the wing-scale to provide vertical bearing surfaces for the vpressure-rolls.

vThe direct bearing of the rolls against the scale is advantageous not only for controlling the cards, lout'alsol be'cause of ythe -accuracy a d simplicity-with which the letter-spaceosition of the wing-scale relative to the printing point can `be obtained and preserved. 'lheletter-spacey osition of the, wing-scale isv Acontrolled y fperipheralr flanges on the scale-pressing rolls, which are arranged to ridein ertical slots "in the' bosses of the wing-scale. The elimination of a' train'of connections between these rolls' and the wing-scale conduces very materially to the accuracy and permanence of the wing-scale adjustment,

@ther features and advantages will hereinafter appear.. Y -lln the accompanying drawings,

Fi re 1 is a front elevation of a front- Astrike Underwood* typewritingma hine with theqpresent improvements appli thereto. igure 2 is a sectional side elevation at about the line 2--2 of Figure 1./

Figure 3` isl a sectional side elevation through the wing-scale, taken atl about the line H of Figure 1.

Figure d is a front eleva ment of the wing-scale. Figure -5 is a horizontal section through one of the horns, at the line 5---5A of vFig- Uure d. f

ln saidUnderwood machine type-bars 10 'swing their types to strike rearwardly against a platen 11 whichk is mounted -upon a, frame 12 thatis shifted up and down by tion of a fragice means of a rail 13. This rail is mounted upon a' swing-frame 14 operated by a. keylever 15. The type-bars are mounted in aL se nt 16. 4 n front of the platen extends a wing-scale 17 which remains stationary while the platen moves endwisev butwhich shifts up and down with the platen. Said wing-scale is connected to a horizontal' bar 20 extending along the segment and bent at its ends to -fo a pair of arms 21, which, at their lower e ds, extend rearwardly under the rail 13 and are pivoted at 22 to the shift-rail frame 14 and held te the frame 14 by springs 23.

Midway of its ends the scale has al typeopening,24 and close to said type-opening aremounted rolls for the wing-scale, said rolls mounted upon the upper ends of springfingers 26, which are attached to the front face of the segment 16by screws 27 which are threaded into holes usually provided in the segment; the improvement being readily apphcable to existing machines.

The middle of the wing-scale has bosses 28 pressed forwardly from its body to bear the pressure of the rolls 25; these bosses being verticallyslotted at 29 to receive peripheral ianges 30 formed on the rolls 25 totit in said slots and prevent relative endwise play between the rolls and the wing-scale 17. The rolls thus run upon the wing-scale at the borders of the slots 29.

' formed to taper from top to bottom, as best It will be notedthat the wing-scale 17 lis supported at its lower end somewhat in advance of the front of the platen 11 and is inclined toward vthe rear to locate its upper scale-bearing ed ein proximity to tix/@platen while .maintaining its body clear .of the laten to avoid obstruction of the work. ince the wing-scale rises vertically ,in its case-shifting movement, however, it is importantl that the rolls 25 bear against vertical surfaces, since otherwise they vwould `cause the-pressure of horns 31 against the platen to. be .varied by the case-shifting movement.` 'The bosses 28 are accordingly shown in Figures- 2 and 3, so that the rollerengaging surfaces of the 'bosses are caused to Yextend vertically.-

The direct engagement of the rolls 25 with the wing-scale is also advantageous, because it eliminates the provision of a train of connections-between these elements, all of which would be factors in determinin the final adjusted plsition of the wing-sca e with relation to t e printing point..

Said rolls bear u 'n the scale\at points close to the pair of orns'31 projecting u wardly from .thel wing-scalek close to -t e printing point, which is 4marked .'Xb and curving rearwardly and .bearing` at thelr tlps against vthe platenll. The horns are' ared by means of pendent ears 18 and screws 129iI7 i laten to guide laterally at 32 away :trernithepA lcards 4under t emselve's,'and

the approaching e area of the stationary horn bearing against the card.

The card may be clipped by its front edge in a card-holder 34 of the usual type, ex-

A card-holder of this type is disclosed inthe patent to Jocrisscn, No. 858,655, granted y Ju1y-2,19e7. y p

It is an yimportant point that the springfingers 26 are made very stiff, and that they are not under'stresswhen there is no work in the machine. 'lfhe horns are not, therefore, required to press against the workwhen the machine is being used, for example,

1.1. In a typewriting machine, the combination with a revoluble up-and-down shiftable platen and writin instrcumentalities,

are also flared at their tipls at` 33 away from the platen to minimize t tending around the platen and fixed thereto.

of a-tl1in,broad card-guide plate supported at the front of the platenAand extending therealongI and mounted to shifthup and down therewith and having a type-clearing recess, and means mounted upon the stationary framework and directly pressing against the card-guide on opposite sides of the weakened portion frmed by the type-clearing recess and close to the pr ting point wherebyV said shifting card-guide is at all times` supported againstbowmg outward at the weakened portion, and the card conseuentky held firmly against said platen at e printing point in all4 positions of the platen.

oluble. platen-therein andqwriting instrumentalities, of an in 2. In a typewriting machine, the combi-. y v nation with a case-shiftable iframe, a revA lis l combined rising wing-scale and card-guide supported to the front of the platen and inclined rearwardly to locate its scale-bearing upper edge inl Aproximity to the platen at the Aline of writ-- ing, and presser-rolls to bear directly against the combined `wing-scale andA card-guide to press the card-guiding- 'portion thereof against the platen, the'combin "wing-scale. and card-guide havi bosses pressed for- '.wardly from it which ta r from top to bottom, to provide vertica walls for engagement with the presser-rolls, so that the pressure of xthe'combined wing-scale and card-guide is caused to remainl uniform in its upper and lower case-positions and in its movement between said positions,

3. In a typewriting machine, the combination with a case-shiftable frame, a revoluble platen therein and writing instrumentalities, comprising a type-segment, ot4 a rising wing-scale shitable between lower and upper case-positions with the platen,

said Wing-scale having letter-space gradua-` tions along its upper edge and having wartical slots at accurately determinedlocations,

' and means for obtaining and preserving an exact letter-spacelocation of the wing-scale graduations relatively to the printing point,

comprising rolls mounted in predetermined relation to the printin point on the typesegment, and havin anges snugly ittlng in the slots of the wlng-scale to ride therein when the wing-scale is shifted between its upper and lower case-positions. i

4. In a typewriting machine, the combi` nation with a traveling carriage, a revoluble platen mounted therein and writing instrumentalities, of a combined scale and cardguide consisting of a thin piece of sheetmetal having card-pressing horns projecting upward and rearward at opposite sides of the rinting point to press the work against the p aten, said horns being tapered and being bent forward alon their tapered edges to increase their rigi ity and reduce the area of rubbing contact with a card in the machine as it travels from side to side with the platen, and means to engage the scale in Eroximitytg the horns to press the horns rmly toward the platen.

5. In a typewriting machine, the combination with a traveling carriage, a revoluble platen mounted-therein with provision for vertical case-shifting movement, and writing instrumentalities,v of a rising scale and card-guide mounted for case-shiftingl movement in unlson with the platen, consisting of a thin piece of sheet-metal having card-pressing horns projecting upward at opposite sides of the printing pointv to pressa card against the laten, sai horns being tapered and bent orward along their tapered edges to increase their rlgidlty, and` bosses pressed forward 'from the body of the scale and guide to stillen the latter and to provide vertical guiding surfaces for controlling the case-shifting movements of. the scale and guide, and means to engage said. guiding surfaces and press the scale andgude toward the platen.

6. In a typewritlng machine, the combination with a case-shiftable revoluble platen and writing lnstrumentallties, of a comblned rising scale and work-guide, and means to press the rising scale toward the platen inv veither upper-case or lower-case position,

machine, the combi having a`type-clearing recess and including work-engagingv fingers extending `upward adjacent both sides thereof, and means f or applying pressure to the scale at opposite sides of the weakened portion formed by the type-clearing recess, substantially beneath the fingers and close to the printing point, whereby the scale iS supported against bowing outward at the weakened portion, and the fingers consequently held in firm engagement with the platen.

Josnrn LINDBURG.

p latemof a relatively 

